Already tested before implantation could've occurred...

When I decided to TTC at the beginning of this cycle, I promised myself that I wouldn't even buy a pregnancy test unless I was three days late. Well... two days ago, at only 5dpo, I caved and took a cheapie. Of course it was negative. I knew it was waaayyy too early, but I tested anyway. I took another cheapie today at 7dpo, and obviously it was negative, and I expected it to be, but I can't stop myself from thinking "WHAT IF IT IS POSITIVE TODAY?" I feel silly. Anybody else test when they know it's too early?